ACTIVITY IDEA Making solar oven by liaoqinmei

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                     ACTIVITY IDEA: Making a solar oven

Millions of people around the world use solar ovens to cook their food. Solar ovens
cause no pollution, the user does not need wood or electricity and, through the
power of the sun, they can cook their food, heat water and sanitise utensils.

In this activity students have the chance to build a solar oven using a cardboard box,
aluminium foil, glass or Perspex, string, tape and a nail.

Instructions

What you will need:
   a cardboard box with lid
   scissors
   aluminium foil
   glass or clear sheet of Perspex
   a nail
   tape
   string
   thermometer
   pot or plate or glass containing water.

Instructions
This experiment needs to be performed
outside on a hot and sunny day.
     Line the inside of the box with
      aluminium foil, including the lid.
     Tape one end of the string to the top
      of the box and tie the other end
      around a nail.
     Push the nail into the ground. This
      will allow you to have the lid open at
      varying degrees to catch the light.
     Place a thermometer inside the box
      and cover it with the Perspex/glass
      sheet.
     Make a note of the initial
      temperature and record the
      temperature every minute for 10 minutes.
     Try heating water and see if you could get it hot enough to make a cup of Milo.
     Divide into groups and compare different effects such as:
            o having the lid at different angles
            o different volumes of water
            o different sized containers.
     Collect and compare results using a table.

Questions
   How much did the temperature change inside the box?
   If you compared your results with other groups, were your results similar? Do
    you think it was a fair test?
   What do you think would happen if you removed the glass? You might want to
    try it and see if you are right.

The Science Learning Hub
www.sciencelearn.org.nz

								
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